On 07/08/2012 04:20 PM, silverdr@wfmh.org.pl wrote: > > On 2012-07-08, at 15:19, Gerrit Heitsch wrote: > >> On 07/08/2012 02:40 PM, silverdr@wfmh.org.pl wrote: >>> >>> I laid out something like here: >>> >>> https://dl.dropbox.com/u/58002657/C64_rf_modulator_replacement.png >>> >>> trying to keep the signal paths (traces) short. It is not yet meant to be placed in the metal housing of the modulator but if that works well I may take some efforts to make a replacement board that goes inside the metal case. The "upper" part is an audio amp for the SIDs. >>> >>> Any comments / striking errors in this? What should I put more attention to? >> >> I see you use pad 1 in this layout. At least on the 250466-Board this is the power supply for the modulator, but it's not +5V but unregulated +9V (usually a bit more). Same goes for a 250407 board. So you either need to add a 78(L)05 or grab the +5V from somewhere else. > > There is a pinhead for +5V to be used for the Y/C amp. That +9V is to be used (via jumper) to power the audio amp in case I like it and want more output ;-) Ok... Then keep in mind that on the 250469 boards (the ones with the 64pin 'PLA'), the modulator pinout is slightly different and it's powered with +5V. It's also smaller. Gerrit Message was sent through the cbm-hackers mailing listReceived on 2012-07-08 16:00:10
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